Rockwell Automation 1606-XLS240E, -XLS240EA, -XLS240EC, -XLS240E-D Power Supply Reference Manual - Manual (Page 11)

All parameters are specified at 24V, 10A, 230Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
Rockwell Automation Publication 1606-RM044A-EN-P — March 2014 11
Bulletin 1606 Switched Mode Power Supplies
10. Reliability
AC 100V AC 120V AC 230V
Lifetime expectancy *) 58 000h 68 000h 71 000h at 24V, 10A and 40°C
117 000h 122 000h 117 000h at 24V, 5A and 40°C
165 000h*) 192 000h*) 200 000h*) at 24V, 10A and 25°C
MTBF **) SN 29500, IEC 61709 478 000h 535 000h 581 000h at 24V, 10A and 40°C
827 000h 926 000h 1 005 000h at 24V, 10A and 25°C
MTBF **) MIL HDBK 217F 334 000h 341 000h 345 000h at 24V, 10A and 40°C; Ground
Benign GB40
460 000h 469 000h 474 000h at 24V, 10A and 25°C; Ground
Benign GB25
*) The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it’s impossible to determine if the failed
unit has been running for 50 000h or only for 100h.